643349332 has 6 divisors (see below), whose sum is σ = 1125861338. Its totient is φ = 321674664.

The previous prime is 643349279. The next prime is 643349347. The reversal of 643349332 is 233943346.

643349332 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 338707216 + 304642116 = 18404^2 + 17454^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643349291 and 643349300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80418663 + ... + 80418670.

Almost surely, 2^643349332 is an apocalyptic number.

It is an amenable number.

643349332 is a deficient number, since it is larger than the sum of its proper divisors (482512006).

643349332 is a wasteful number, since it uses less digits than its factorization.

643349332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160837337 (or 160837335 counting only the distinct ones).

The product of its digits is 139968, while the sum is 37.

The square root of 643349332 is about 25364.3318855435. The cubic root of 643349332 is about 863.2745772124.

The spelling of 643349332 in words is "six hundred forty-three million, three hundred forty-nine thousand, three hundred thirty-two".